Eur. Phys. J. C (2010) 66: 173-185
https://doi.org/10.1140/epjc/s10052-009-1232-7

Regular Article - Theoretical Physics

Estimates of hadron azimuthal anisotropy from multiparton interactions in proton–proton collisions at   TeV

¹ Laboratory for Nuclear Science, MIT, Cambridge, MA, 02139-4307, USA
² Institut de Ciències del Cosmos & ICREA, Univ. Barcelona, 08028, Barcelona, Catalonia, Spain
³ Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119991, Moscow, Russia
⁴ Department of Physics, University of Oslo, PB 1048 Blindern, 0316, Oslo, Norway

^* e-mail: dde@cern.ch

Received: 21 October 2009
Revised: 4 December 2009
Published online: 5 January 2010

Abstract

We estimate the amount of collective “elliptic flow” expected at mid-rapidity in proton–proton (p–p) collisions at the CERN Large Hadron Collider (LHC), assuming that any possible azimuthal anisotropy of the produced hadrons with respect to the plane of the reaction follows the same overlap-eccentricity and particle-density scalings as found in high-energy heavy-ion collisions. Using a Glauber eikonal model, we compute the p–p eccentricities, transverse areas and particle multiplicities for various phenomenological parameterisations of the proton spatial density. For realistic proton transverse profiles, we find integrated elliptic-flow v ₂ parameters below 3% in p–p collisions at  TeV.